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发明名称
Utblåsningssikring av avstengertypen
摘要
申请公布号
NO303881(B1)
申请公布日期
1998.09.14
申请号
NO19930003836
申请日期
1993.10.25
申请人
HYDRIL CO
发明人
MORRILL, CHARLES D.
分类号
E21B33/06;(IPC1-7):E21B33/06
主分类号
E21B33/06
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代理人
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